Telephone transmitter



L. STEINBERGER.

TELEPHONE TRANSMITTER.

APPLICATION FILED-JUNE 26,1919.

1,414,442. a Patented May 2, 1922.

INVENTOR llou/Is ,S/e/hberyer UNITED smi es Parent orrica.

LOUIS :STEINBERGER, OF BRObKLYN, NEW YORK, N. Y-

TELEPHONE TRANSMITTER.

a lic tion filed June 26,

To all whom it may concern."

. Be it known that 1, Louis STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn, city and State of New "York, have invented certain new and'useful Improvements in Telephone Transmitters; of which the following is a specification.

My invention relates to improved telephone transmitters in which the cover of the transmitter casing, or in other words, the transmitter cap which is usually constructed of metal. is provided-with a perfor'ated integral plate forthe passage of sound waves to which plate a bottomless hollow mouthpiece is adjustably secured.

One of the objects of the invention, therefore, is to so construct a transmitter cap provided with perforations therethrough constituting sound passages and also a recessed portion adjacent said sound passages preferably formed by a' flange encircling said perforations, which flange is provided with means for securing a bottomless mouthpiece thereto.

Another object of the invention is to so form the flange of the cap to which a bottomless mouthpiece is secured that its inner side joins the perforated portion of the plate by a smooth curved surface, thereby enabling the exposed portion of the transmitter to be readily kept clean and free from dust, there being-inc square corners in the mouthpiece within which dust, germs &c., may be collected.

nother object of the invention is to pro- .vide atelephone Itransmitter which is of few parts, easily assembled, readily cleaned and much less likely to be broken than transmitters in which the removable mouthpiece is provided with a perforated bottom.

Other objects will appear from the subj'oined specification and claims.

In the drawing in which the same reference character indicates the same part in the several views:

Fig. 1 is a vertical section ofan improved telephone transmitter construction embodying my invention;

Fig. 2 is a view similar to Fig. 1 but of slightly modified construction. 1

Fig. 3 .is a detail in section and partly broken away.

In Figure 1,- A indicates a metallic cap or cover secured to the usual sound trans- Specification of Letters Patent.

of and integral with the cap A is bordered Patented May 2, 192 2. 1919. semi No. 306,791.

mltter casing C by means consisting preferably of inter-engaging. screwthreads 10 and 11 respectively on'the outer surface of the flange 12 of the cover A and on the inner surface of the casing v The caslng C is of the usual construction and the capv A may be secured to it in any other suitable way, (Fig. 2).

The plate 30 forming the central portion by a flange 31 extending outwardly from the cap, and is provided wlth cone shaped perforations 40, to form sound passages therethrough. i

In Fig. 1, the flange 31 is shown as pro vided with internal screwthreads 32, and in Fig. 2 the flange 31 is provided with external screwthreads 32 and each extends upwardly from the central portion of the late and encircles the aforesaid perforations 40 in the central portion thereof thus forming a recess or [cavity between the perforated portion and the flanges, said flanges being for the purpose of securing thereto the bottomless mouthpiece B which is usually made of suitable insulating material. The moldable insulating material well known in the art as electrose is very well adapted for this purpose.

metallic flange surrounding the erforated portion of the cap, the latter 0 which is curved or rounded at 42 to join the upper surface 43 of'the central portion 30 of the cap A so as to form. a rounded bottom for the cavity 60 in order to readily keep the transmitter clean and free from accumulated dust germs. and the like. As the recess or cavity in the cover or cap extends beyond the perforated portion 30 this structure may be satisfactorily used in service without the aid of the removable mouthpiece B.

It will readily be seen that the perforated 100 portion of the plate 30 forming a portion ofthe cap and which plate is situated at the base of the mouthpiece cannot be readily I broken by accident or otherwise, as by the mere impact of pencils, paper cutters or 105 the user of the telephone.

In addition to this, a further advantage is due to the fact that the construction of the 110 isin line with the inner surface 41 of the g5 removableniouthpiece B which is required in connection withtransmitter tops is very much cheaper to manufacture than a mouthpiece provided with an integral perforated as shown in Fig. 3 for the purpose of forming a convenient means for securing the porcelain or lass to the screwthreads 32' on the metallic flange 31' projecting from the cap, as will be readilyunderstood.

The metal securing ring when used in connection with the glass or porcelain mouthpiece is, as above stated, cemented in place whereas inthe event that the m tal ring is used in connection with a mouthpiece constructed of moldable insulating material, such as electrose, the ring may be molded in place, as will be clearly understood.

As previously stated, the perforated cap A is preferably made of metal, although 1t may be made of any suitable insulating material and is integral throughout, and the mouthpiece B is preferably made of either moldable or any other suitable well known insulating material, and is. hollow throughout being formed without the usual perforated bottom portion.

As changes of construction could be made within the scope of my invention, I intend that all matter contained in the above description or shown in the accompanying drawing shall beinterpreted as illustrative and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is: v

1. In a telephone transmitter, an integral cover for a sound transmitter casing, having sound passages extending therethrough' into a recess or cavity formed in the outer face of said cover and a bottomless mouthpiece removably secured to the side wall of said recess or cavity, said recem having a substantially smooth or unobstructed surface and forming a smooth joint with said mouthpiece.

2. In a telephone transmitter, an integral cover for' a: sound transmitter casing, provided with sound passages therethrough, and a recessed portion adjacent said sound passages, the said sound passages being conical in form, the enlarged portion extending outwardly and a bottomless mouthpiece removably secured to the side wall of said recess or cavity, said recess having a substanadjacent walls of themouth piece and sides of the said hollow portion form a continuous unbroken surface. A

v 4. A telephonetransmitter comprising a mouthpiece of insulating material in the form of a hollow flared shell, and an integra-l metallic transmitter cap having a substantially smooth, unobstructed rforated portion opposite the orifice of said mouthpiece, said transmitter cap and said mouthpiece being provided with coacting screwthreads for securing them together.

5. A. telephone transmitter comprising a mouthpiece of insulatin material in the form of a hollow flared shell, and a metallic transmitter cap having a perforated portion opposite the orifice in said mouthpiece, and a screwthreaded flange bounding said perforated portion for securing said mouthpiece thereto, the surface of said perforated portion. being substantially smooth and unob-' structed.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 20 day of June,

' LOUIS STEINBERGER. In presence of i ZITA Ml GRAHAM. 

